diff options
| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2023-08-25 00:01:36 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-10-04 15:19:32 -0700 |
| commit | e47d86083c66525b89c7fc66cdd64d5937725563 (patch) | |
| tree | c7a2a4b5ef893299a54ced0955ac5406f6011777 /arch/x86/kvm/cpuid.c | |
| parent | 6f0f23ef76be11bc6ace10df5e807f3542da8772 (diff) | |
KVM: x86: Add SBPB support
Add support for the AMD Selective Branch Predictor Barrier (SBPB) by
advertising the CPUID bit and handling PRED_CMD writes accordingly.
Note, like SRSO_NO and IBPB_BRTYPE before it, advertise support for SBPB
even if it's not enumerated by in the raw CPUID. Some CPUs that gained
support via a uCode patch don't report SBPB via CPUID (the kernel forces
the flag).
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/a4ab1e7fe50096d50fde33e739ed2da40b41ea6a.1692919072.git.jpoimboe@kernel.org
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 8f26a929d510..552dc4f3899b 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -764,6 +764,7 @@ void kvm_set_cpu_caps(void) F(NULL_SEL_CLR_BASE) | F(AUTOIBRS) | 0 /* PrefetchCtlMsr */ ); + kvm_cpu_cap_check_and_set(X86_FEATURE_SBPB); kvm_cpu_cap_check_and_set(X86_FEATURE_IBPB_BRTYPE); kvm_cpu_cap_check_and_set(X86_FEATURE_SRSO_NO); |